Here is another account of the catching of that black marlin, and I believe it is being told by one of the camera men that filmed it. Other captains readily agree that the fish was well over the 1,000 pound mark and other think it was over 1,200. So, I guess it might have been a world record on 50 lb test. Problem is, we will never know for sure because Neil Patrick decided to let it live instead of getting a world record. Good for him.
http://www.worldwidefishing.com/press.html?id=164